Small Flat Air Conditioning
In a small flat the issue is usually space and whether you’re allowed to mount an outdoor condenser. A portable or window unit up to 10,000 BTU cools a living room or bedroom with no installation and no exterior changes — ideal for apartments and leasehold properties.
If you own the flat and can mount an outdoor unit, a small split system is quieter and far more efficient for everyday use.
What to look for
- Portable and window units need no outdoor condenser
- Up to 10,000 BTU suits most one-bedroom flats
- Self-install — no landlord permission needed for a plug-in unit
- Compact footprints fit tight London and city apartments
Best units for small flat air conditioning
TCL 8,000 BTU Smart Inverter Window Air Conditioner
TCL 5,000 BTU Mechanical Window Air Conditioner
Midea 6,000 BTU U-Shaped Smart Window AC – Black
Midea 10,000 BTU SmartCool Window Air Conditioner
Sealey Industrial Spot Cooler Air Conditioner 6,800Btu/hr (2kW)
Sealey Industrial Spot Cooler Air Conditioner 8,500Btu/hr (2.5kW)
Baridi 5-in-1 Portable Air Conditioner, Dehumidifier & Air Cooler 7,000Btu/hr
AuraHome 9000 BTU 4-in-1 Portable Air Conditioner, Dehumidifier & Cooling Fan
Belaco 9000 BTU Portable 4-in-1 Air Conditioner
Belaco 9000 BTU Portable Air Conditioner with Dehumidifier
Midea 9K BTU Portable Air Conditioner with WiFi
Midea Eco 7000 BTU Portable Air Conditioner
Small Flat Air Conditioning — frequently asked
Can I fit air conditioning in a rented flat?
A portable unit needs no fixed installation — it vents through a window kit — so it suits rented and leasehold flats with no landlord sign-off. A split or window unit needs permission and is usually for owner-occupiers.
What size air conditioner for a small flat?
Up to 10,000 BTU usually covers a living room or bedroom in a one-bedroom flat. Size per room rather than the whole flat, since portable units cool one space at a time.
Is a portable unit noisy in a small flat?
It’s noisier than a split because the compressor is indoors. Look for a low dB rating and a sleep mode, and place it near the window where the hose vents.